Question

Решите пожалуйста по математике кто решит 40 дам

Answer 1

Ответ:

1)

$7(x + 4) = 6(2x - 3) \\ 7x + 28 = 12x - 18 \\ 5x = 46 \\ x = \frac{46}{5} \\ x = 9 \frac{1}{5}$

2)

$2(x + 3) = 5(2x - 4) \\ 2x + 6 = 10x - 20 \\ 8x = 26 \\ x = \frac{26}{8} \\ x = 3 \frac{2}{8} \\ x = 3 \frac{1}{4}$

3)

$7x = - 4 \\ x = - \frac{4}{7}$

4)

$18x = - 2 \\ x = - \frac{2}{18} \\ x = - \frac{1}{9}$